Usually, the message about unique identification means that you probably still haven't found the right mix of properties to uniquely identify. It may be that you might have to look at things like caption or something else, but engage the use of wildcards. some other ways are to use "Required Children" as a means of saying "If it matches this set of properties and has these child objects in it's hierarchy". In other words, you'll have to do a bit more work to get this figured out. Be cautious, also, at using wildcards TOO much. If you use wildcards TOO much you can create situations that the objects cannot be uniquely identified.
As for adjusting aliases, it is really just a matter of Click and Drag. Check out this article.
http://smartbear.com/support/viewarticle/12465/